Camshaft adjuster

Abstract

An electrically-actuatable camshaft adjuster includes an adjustment gear which has a drive wheel with an external toothing. The adjustment gear also has an additional ring-shaped component which is solidly screwed to the drive wheel. In particular, the drive wheel has internal threading into which outer threading of the ring-shaped component is screwed.

The invention claimed is: 
     
       1. A camshaft adjuster that has an adjustment gearing, comprising a drive gear with an outer toothing configured to be driven by a tensioning device, and a further annular component securely screwed thereto, wherein the drive gear has an inner threading concentric to its axis of rotation, into which an outer threading of the further annular component is screwed;
 wherein the further annular component is a drive ring gear with an inner toothing; 
 wherein the further annular component has a centering contour corresponding to a central hole of the drive gear; and 
 wherein the central hole is disposed between a flange and the outer threading of the drive ring gear. 
 
     
     
       2. The camshaft adjuster according to  claim 1 , wherein the adjustment gearing includes a planetary gearing, and the drive ring gear is a component of the planetary gearing. 
     
     
       3. The camshaft adjuster according to  claim 1 , wherein the further annular component has an actuation contour on its circumference for a tool, the actuation contour extending radially over a circumferential surface of the drive gear. 
     
     
       4. The camshaft adjuster according to  claim 3 , wherein the actuation contour is disposed radially inside the outer toothing of the drive gear. 
     
     
       5. The camshaft adjuster according to  claim 1 , wherein there is a plane that is perpendicular to a central axis (A) of the adjustment gearing, which intersects both a cylindrical circumferential surface of the drive gear as well as the centering contour of the drive gear. 
     
     
       6. The camshaft adjuster according to  claim 1 , wherein the screw connection of the inner threading and the outer threading is reinforced by additional securing structure. 
     
     
       7. A camshaft adjuster comprising:
 adjustment gearing configured to rotate about a central axis; 
 a drive gear having outer toothing configured to be driven by a tensioning device, and an inner-facing surface facing toward the central axis, the inner-facing surface defining inner threading, and the drive gear defining a central hole; and 
 a drive ring gear coupled to the adjustment gearing and having an outer-facing surface facing away from the central axis, the outer-facing surface defining outer threading mating with the inner threading such that the drive gear and the drive ring gear are coupled together via a screwing engagement, wherein the drive ring gear includes a centering contour corresponding to the central hole, wherein the central hole is disposed between a flange and the outer threading of the drive ring gear. 
 
     
     
       8. The camshaft adjuster of  claim 7 , wherein the adjustment gearing includes planetary gearing. 
     
     
       9. The camshaft adjuster of  claim 7 , wherein the drive ring gear defines a circumference having an actuation contour configured to receive a tool, the actuation contour is radially outward of a circumferential surface of the drive gear. 
     
     
       10. The camshaft adjuster of  claim 9 , wherein the actuation contour is radially inward of the outer toothing of the drive gear. 
     
     
       11. A camshaft adjuster comprising:
 a drive gear having an outer surface configured to be driven by a chain, and an inner-facing surface defining inner threading, the drive gear defining a central hole; 
 planetary gearing including, an outer drive ring gear, the drive ring gear having an outer-facing surface defining outer threading mating with the inner threading such that the drive gear and the drive ring gear are coupled together via a screwing engagement, wherein the drive ring gear includes a centering contour corresponding to the central hole, wherein the central hole is disposed between a flange and the outer threading of the drive ring gear.